 The tectonic plates here are under constant collision resulted the changes in river course.A comparative study of the Survey of India topographic sheet published in 1973 with the remote sensing images of 1989-90&1992-93 coupled with observations from recent field visits, confirms the process of formation of this vast wetland besides some small but constant changes in topography occurring every year.This wetland is still connected with the river Ganga(Bhagirathi) and its hydrology is mainly controlled by the river Ganga.